Ticking noise from under hood

[Gho$t]

Dont know if you've solved your problem but it almost sounds like an exhaust leak coming from where, for me atleast it was the smog tube the has a bolt that goes to the back of you engine block. I had to start my car and try to move this piece around and tighten at the same time till it didnt leak anymore. I wish I could describe it better but I still dont know what the piece is called. May help may not but hopefully it will.